#pragma once

// MySQL 版本

#include <iostream>
#include <string>
#include <vector>
#include <unordered_map>
#include <fstream>

#include <cassert>

#include "../comm/log.hpp"
#include "../comm/util.hpp"

#include "include/mysql.h"

namespace dsh_model
{
    using namespace dsh_util;
    using namespace dsh_log;

    struct Question
    {
        std::string number; // 题目编号
        std::string title;  // 题目标题
        std::string star;   // 难度
        std::string desc;   // 题目的描述
        std::string header; // 题目预设给用户在线编译器的代码
        std::string tail;   // 题目的测试用例，要和header拼接
        int cpu_limit;      // cpu时间限制，单位为S
        int mem_limit;      // 空间限制，单位为KB
    };

    const std::string oj_questions = "oj_questions";
    const std::string host = "127.0.0.1";
    const std::string user = "oj_server_client";
    const std::string passwd = "123456";
    const std::string db = "oj";
    const int port = 3306; 

    class Model
    {
    public:
        Model()
        {}
        ~Model()
        {}

        bool QueryMySql(const std::string& sql, std::vector<Question>* out)
        {
            // 创建MySQL句柄
            MYSQL* my = mysql_init(nullptr);

            if (nullptr == mysql_real_connect(my, host.c_str(), user.c_str(), passwd.c_str(), db.c_str(), port, nullptr, 0))
            {
                LOG(FATAL) << "连接数据库失败！" << std::endl;
                return false;
            }
            // 一定要设置连接的编码格式，不然会乱码
            mysql_set_character_set(my, "utf8");

            LOG(INFO) << "连接数据库成功!" << "\n";

            // 执行sql语句
            if (0 != mysql_query(my, sql.c_str()))
            {
                LOG(WARNING) << sql << " execute error!" << std::endl;
                return false;
            }

            // 检测结果
            MYSQL_RES* res = mysql_store_result(my);

            //  分析结果
            int rows = mysql_num_rows(res);   // 获得行数
            int cols = mysql_num_fields(res); // 获得列数

            for (int i = 0; i < rows; i++)
            {
                MYSQL_ROW row = mysql_fetch_row(res);
                struct Question q;
                q.number    = row[0];
                q.title     = row[1];
                q.star      = row[2];
                q.desc      = row[3];
                q.header    = row[4];
                q.tail      = row[5];
                q.cpu_limit = atoi(row[6]);
                q.mem_limit = atoi(row[7]);

                out->push_back(q);
            }

            // 释放结果空间
            delete res;

            // 关闭mysql连接
            mysql_close(my);

            return true;
        }

        bool GetAllQuestions(std::vector<Question>* out)
        {
            const std::string sql = "select * from " + oj_questions;
            return QueryMySql(sql, out);
        }

        bool GetOneQuestion(const std::string& number, Question* q)
        {
            bool res = false;
            const std::string sql = "select * from " + oj_questions + " where id = " + number;
            std::vector<Question> result;
            if (QueryMySql(sql, &result))
            {
                if (result.size() == 1)
                {
                    *q = result[0];
                    res = true;
                }
            }
            return res;
        }

    };
}